UK Immigration Law
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Although they would be within their rights to ban you from re-entering if you overstay by any length of time generally there is a convention (though not a rule/law) that no such action is taken if you overstay by less than 28 days. If you make a further application for re-entry you will have to explain why you overstayed and its best to have a good reason for doing so.
An overstay would not be atomatically fatal to a further application for re-entry but you would have to explain it, and it would also be much better to volunteer the information rather than tender it upon request.
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